Machine for dressing or surfacing stone and other uses.



G. H. CUNDIGT.

MACHINE FOR DRESSING 0R SURFAGING STONE AND OTHER USES.

APPLICATION FILED JULY 1-1, 1908.

990,425, Patented Apr. 25, 1911.

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G. H. OONDIOT. Y MACHINE FOR DRESSING 0R SURFAOING STONE AND OTHER USES.

APPLICATION FILED JULY 11, 1908.

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Patented Apr. 25, 1911.

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by /5 I /@M 7 Atty4 UNITED STATES PATENT OFFICE.

GEORGE HERBERT CONDIGT, OF PLAINFIELD, NEW JERSEY, ASSIGNOR TO WILLIAMDULLES, OF NEW YORK, N. Y.

MACHINE FOR DRESSING OR SUB/FACING STONE AND OTHER USES.

Specification of Letters Patent.

Application filed July 11, 1908.

Patented Apr. 25, 1911.

Serial No. 443,142.

To all whom it may concern:

lie it known that I, (lnouce IInunnu'r CON- nic'r, of Plainiield, NewJersey, have invented certain new and useful Improvements in Machinesfor Dressing or Surfacing Stone and other Uses, of which the followii'igis a specification, accompanied by drawings.

The invention is designed primarily as a machine for dressing orsurfacing stone and other uses and it will be readily seen that manynovel features of the invention are applicable alike to rock drills,riveting machines, hammers, etc.

In its most complete form the invention comprises a machine that is veryreliable in operation, easy to handle, and readily adjustable to movethe tool horizontally in any direction and to raise and lower it.

In the following description and claims the invention is set forth inits most preferred form as applicable to dressing or surfacing stone,and from this description and claims the various novel parts of theinvention will be readily understood.

In the drawings, Figure 1 is a side elevation of a complete machineembodying the invention in a preferred form. Fig. 2 is a view partly invertical section showing the casing and the reciprocating and rotaryparts carried thereon for actuating the tool. Fig. 3 is a plan viewbelow the plane 3-3 of Fig. 2. Fig. 4 is a horizontal section on theplane 44 of Fig. 2. Fig. 5 is a detailed vertical section on the plane55 of Fig. 2.

In the drawings I have chosen to illustrate the mechanism as mountedupon a base or portable truck B and mast C which turns in a socket inthe base B and supports the vertically adjustable carriage D. Thecarriage is adjustable vertically upon the mast by means of arack-and-pinion, or in any other suitable way, the wheel d, and the pawland ratchet illustrated serving to raise and lower the carriage D.Horizontally adjustable upon the carriage D is the supporting arm Ecarrying, preferably at one end, an electric motor F and at its otherend the casing G. The arm E may run freely through the carriage D uponfour or more rollers, as shown, thus providing for radial adjustmentwhile the turning of the mast C provides for annular horizontaladjustment and the raising and lowering of the carriage for verticaladjustment. The motor is provided with a suitable electrical controller7 at the end of the arm near the casing G and the tool proper II. Themotor is, of course, supplied with. current from any suitable source,the conductors not being illustrated.

In addition to the vertical adjustment afforded by the carriage I), thecasing (i is provided with a fine screw adjustment for raising andlowering it. The casing is provided with slides g which travel invertical ways in the jaws or bracket 6 at the end of the arm E. Thecasing (Jr is adjustably supported by the screw-shaft K which isthreaded through the sleeve 9 on the side of the casing by means ofsuitable bushings, as indicated, and rests at its lower end in a bearingin the bracket 6. The lower end of the casing Ur is closed by the head9" within which is loosely guided the shank of the surfacing tool H. Thetool, which is a reciprocating tool, in contradistinction to rotatingtools, is actuated by the hammer member L which reciprocates within acylinder M, which latter is guided and reciprocated within the casing G.The upper end of the cylinder M is closed. Its walls surround and makeairtight contact with the piston por tion Z of the hammer L. The lowerend of the hammer projects through an airtight annular head in the lowerend of the cylinder M. The air above and below the free flying piston Zforms elastic cushions for reciprocating the hammer, as well understoodin connection with rock drills. The cylinder M is reciprocated by theconnecting rod 0 and crank shaft P, which latter has bearings in theclosed upper portions of the casing G, as shown.

The upper end of the casing is completely inclosed and the reciprocationof the cylinder M tends to cause the alternate compres sion andrarefication of the air within it. The crank shaft is provided with avalve opening p and is drilled or bored from this opening 79 through tothe interior of the casing so that the casing is in free communicationwith the valve opening p. This opening, which is preferably rectangular,opens alternately to an upper port Q, in communication with pipe Q and alower port R in communication with a pipe or duct S that leads to theinclosed lower end of the casing G. The valve opening should be of suchsize that when the cy inder M is at the upper end of its stroke, thevalve opening is closed and stands as seen in Fig.

5. As the shaft turns and the cylinder begins to move downward, thevalve opening 79 opens the port Q, allowing the cylinder M to draw airinto the upper end of the easing through the pipe Q. As the cylinder Mapproaches the lower end of its stroke, the port Q is closed, and as thecylinder begins its return stroke in the upward direction the valveopening 79 in turn communicates with the port R, allowing the air in theupper end of the casing to be forced through the pipe or duct S to thelower end of the casing. As the cylinder M again approaches its upperlimit the port R is closed. During the up-stroke therefore, the airpasses freely from the upper to the lower end of the casing. During thedown-stroke air is sucked into the upper end of the easing, and the aircompressed below the piston passes out through a duct or pipe T. Thisduct or pipe T is of lead or other suitable semi-fiexible material, bywhich I mean that it is sufliciently inflexible to maintain its positionduring the operation of the apparatus yet is sufiiciently flexible to beeasily bent and adjustable by hand so as to direct the issuing blast orair at the particular angle desired to blow away the dust or chipsformed by the tool.

It will be seen that I utilize the reciprocating parts of the mechanismto compress or pump air, and this pumping of the air may be utilized inseveral difi'erent ways. It may be used to blow away the dust, asexplained. It also serves to maintain a mean pressure which is greaterthan atmospheric pressure in the lower end of the casing G and itthereby prevents the dust that is suspended in the atmosphere from beingcarried into the casing around the shank of the tool or otherwise,because, during the up-stroke, suction in the lower end of casing iseither eliminated or greatly reduced by the air that is supplied throughthe pipe S, while during the down-stroke the port R is closed and theair is com-- pressed and forced out from the lower end of the casingthrough the duct T and through any intervals where leakage occurs, asfor example around the shank of the tool.

It will be seen that so far as blowing away the dust from the workingend of the tool is concerned, the connection could be direct from thepipe S to the duct T, but this would not provide for the supply ofrelatively clean air to the lower end of the casing G, as described. Thesuction port Q and the pipe Q are utilized to draw air through thecasing of the motor F, as indicated in Fig. 1, and as this air may bedrawn in through the screen or nettingf through the casing of the motorat a point remote from the tool H, a relatively clean supply of air forthe interior of the casing of the tool is assured.

The motor F drives the shaft 1 by means of the rotary flexible drivingconnection V which may comprise two universal joints 1 which provide forthe vertical adjustment of the casing and tool relatively to the motor Fand the arm E by means of the screw shaft K and its hand-wheel 7a. Inorder to get a maximum blow and maximum etliciency upon the tool, avertical adjustment of the casing relatively to the working too]. Hwhile the machine is in operation is a great advantage. For veryconsiderable vertical adjustment the machine may be stopped and thecarriage D raised or lowered.

The operation of the machine described when used for dressing the stoneis as fol lows: The machine having been moved to the proper position foracting upon the upper surface of the stone that is to be treated, thearm 1'] is raised to the convenient height and drawn out and swungaround as may be necessary to bring the tool to the proper position uponthe work, whereupon the mechanism is started and the tool is adj ustedto give the best effect by turning the hand-wheel 1. The dirigible ductT being bent to properly direct the blast upon the work, the dressingaction proceeds very rapidly and the operator moves the toolhorizontally over the surface of the stone to reach its variousportions. The handwhee]. adjustment not only enables the tool to beadjusted to give the best effect, but also permits it to be raised toattack high points upon the surface without necessitat ing the stoppingof the machine to raise or lower the carriage D. Y

I have not described the details of the journal hearings or bushingssuch as are shown around the crank shaft P. These and many other mattersof mechanical detail, and indeed the forms and proportions 'of thevarious parts illustrated and described may be widely varied withoutdeparting from the principles or mode of operation of the invention, Atthe lower end of the casing G I have shown a cushion W which may be ofrubber or other yielding material to receive the blows of the hammer andprevent injury to the casing when the tool H is not in proper positionto receive the blows of the hammer.

Various other details and additions will occur to the skilled mechanicor those familiar with the art and may be utilized without affecting theinvention.

I claim and desire to protect the following:

1. Machine for dressing stone or other uses, comprising a casing,toolactuating mechanism carried bythe said casing and comprising arotary shaft, a member reciprocating in the said casing and actuated bythe said shaft, a hammer connected to be actuated thereby and the toolactuated by the said hammer, a motor actuating the said shaft, an airconduit connecting the said motor with the said casing, the said shaftbeing provided with openings forming a valve controlling the passage ofair through the said conduit, for substantially the purposes set forth.

2. Machine for dressing stone or other uses, comprising a casing,tool-actuating inechai'iism carried by the said casing and conun'ising arotary shaft, a member reciprocating in the said casing and actuated bythe said shaft, a hammer connected to be actuated thereby and the toolactuated by the said hammer, the said shaft having valve openings incommunication with the interior of the casing, a conduit leading fromthe said valve to the lower or forward end of the casing, and a duct Tleading from the casing to the proximity of the tool, for substantiallythe purposes set forth.

3. Machine for dressing stone or other uses, combining a rotary motor,reciprocating tool-actuating parts driven thereby, a casing within whichsuch parts reciprocate, and an air duct connecting the motor and thesaid casing, whereby the reciprocation of the parts may draw air throughthe motor.

4. Machine for dressing stone or other uses, combininga rotary motor,reciprocating tool-actuating parts driven thereby, a casing within whichsuch parts reciprocate, an air duct connecting the motor and the saidcasing, whereby the reciprocation of the parts may draw air through themotor, and a duct leading from the casing for directing a jet of air tothe work.

Mechanism for dressing stone or other uses, having a casing, areciprocating tool actuating member therein, a driving shaft connectedtherewith, a valve actuated therewith, and air connections therefromconnecting with the said casing for admitting air first to one end ofthe casing and thence to the other end.

(S. .lVlechanism for dressing stone or other uses, having a casing, acylinder reciprocating therein, a tool-actuating piston reciprocatingwithin the cylinder, a shaft connected to reciprocate the cylinder, andvalved pneumatic connections for the air compressed or pump ed by thereciprocating action of the mechanism.

7. Mechanism for dressing stone or other uses, having a casing, acylinder reciprocating therein, a tool-actuating piston reciproeatingwithin the cylinder, a shaft, a crank and connecting rod inclosed withinthe easing, and valve-controlled connections for alternately adi'nittingand delivering air to and from the inclosed space containing the crankand connecting rod.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses, June 25, 1908.

GEORGE HER-BERT OONDIOT.

Witnesses E. VAN 7 AND'r, HERMAN MORRIS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). C.

